Hi Wotto
I grabbed the chart at lunch and took a few posts off the playfield to see the original colours of the playfield. Note: my pantone chart is a few years old but quite close I am sure.
The colours of photos I have seen look close to the playfield colours therefore the following was a close match and better than nothing.
White - I can't do this as my chart just has one white so I suppose closest to the apron white or vinyl white ???
Red - Pantone 032C - RGB equivalent 207,67,57
Blue - Pantone 3115C - RGB equivalent 0,77.6,84.3
The blue on my playfield was very different to what is under the plastic but I am not quite up to cleaning it as just gearing up for a restore closer to summer. The blue is close the backglass light blue with a bit more green to it.
I hope this helps.